defaultCustomFields is not consistently applied

[FND]

It is currently possible to unwittingly create a tiddler which is missing the default custom fields (config.defaultCustomFields):

var tiddler = new Tiddler("Foo");
store.addTiddler(tiddler);

This is contrary to expectations, and should thus be considered a bug.

[MartinBudden]

Milestone 2.6.2 deleted

[MartinBudden]

It is not possible to tell if this is an unwitting error, or the desired behaviour. In any case if there is an error, it's a programming error, not a user error. In general we don't protect against programming errors. So won't fix.